Why does Mangabuddy block spellcheck in their comment text fields?
You made me create a browser add-on to fix it.
https://sh.nu/qamkeg
So, you still agree that it wasn't her first gift.
It's just bad writing. You can probably explain it away if you put enough energy in, but the writer could have done a much better job so it wouldn't require so much work on your part.
When a character makes such a flat statement that's obviously not true, the writer is generally either:
1) Setting up for it to be discussed later.
2) Set up the character to lie previously.
3) Didn't realize they made a writing mistake due to [insert reasons].
If the writer makes their audience's eyebrows rise because a character obviously lies but nothing comes from it, they are just training their audience that their writing lacks nuance, consideration and depth. Then later, when the audience misses some key thing a character hinted at earlier, the audience is annoyed because they've gotten used to the lazy writing style otherwise they probably would have noticed sooner. Generally speaking, it's easy to gloss over stuff like this when it's a comedy but when it's supposed to be serious the writer doesn't have as much leeway to be careless.